Chiroptical study of the bimetal–cysteine hybrid composite: interaction between cysteine and Au/Ag alloyed nanotubes

Liu, Huali; Li, Zhen; Yan, Yan; Zhao, Jiaqi; Wang, Yu

doi:10.1039/c9nr07421j

Cited by 17 publications

(15 citation statements)

References 45 publications

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“…To make chiroptical materials truly useful in practice, even larger chiral asymmetry (greater g values) is preferred or even necessary. It is now well established that CD coupled with plasmonic resonance depends on the size of the nanostructures as well as their constitution, geometry, and the relative locations of neighboring particles 38,39 . The CD of our system (the frequency of which coincides with interband transitions) has been found to vary with these parameters as well, but in different ways.…”

Section: Discussionmentioning

confidence: 99%

Highly enantioselective photo-polymerization enhanced by chiral nanoparticles and in situ photopatterning of chirality

Feng

Shan

et al. 2020

Nat Commun

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Chiral noble metal nanoparticles has recently gained great interest due to their potential applications including ultrasensitive chiral recognition and asymmetric synthesis. We anticipate that they could be utilized to induce asymmetric photo-polymerization reactions with high enantioselectivity and reactivity. Here, we report such a system. By employing silver nanoparticles modified with cysteine as the chiral inducer, polydiacetylene (PDA) with high chiral asymmetry was obtained from achiral diacetylene monomers triggered with unpolarized UV light. Furthermore, the helical sense of chirality can be controlled by varying the wavelength of UV irradiation. This enables a feasible and economical method to fabricate programmable 2D patterns of chiral PDA with tailored chirality distributions, such as smooth gradients in chirality and micropatterns with tailorable circularly polarized luminescence. Our finding not only opens a pathway for producing programmable chiroptical micropatterns, but also is highly valuable for deeper understanding of symmetry breaking in enantioselective photochemical reactions.

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Section: Discussionmentioning

confidence: 99%

Highly enantioselective photo-polymerization enhanced by chiral nanoparticles and in situ photopatterning of chirality

Feng

Shan

et al. 2020

Nat Commun

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“…Currently, various MOSs sensors have been employed to detect H 2 S due to its merits including low cost, fast response, and easy fabrication. − However, single MOSs gas sensors are difficult to match well with the actual requirement due to their rather high detection limit and low response . Therefore, the performance improvement of MOS-based sensors also has become the focus of people’s research. , Noble metals (such as Pd, Au, Rh, and Ru et al) in combination with MOSs always exhibit unique properties in the gas sensor fields owing to their specific chemical and electronic sensitization properties. − Moreover, some experiments have proved that noble metal/MOSs with high sensing performances could be easily designed by controlling the size, morphology, and dispersion of noble metals. ,− At present, the multielement system (includes two or more noble metals) is particularly attractive in the various fields (including biomedical diagnosis and therapy, energy storage and conversion, gas sensors and catalysis) because of material synergistic effects with unusual optical, electrical, chemical, and catalytic behaviors. ,− Among them, in the field of the gas sensor, bimetal can not only modulate the carrier concentration of the materials but also catalyze the reactions between detected gas molecules and surface-adsorbed oxygen species, which attracted more attention of the researchers. Hee-Tae Jung et al reported that Pd/Au and Pd/Pt bimetallic line arrays show the shortest response time (2 s to 1% H 2 ) in comparison with those of Pd-based H 2 sensors reported previously and a limit of detection below 1 ppm (ppm) .…”

Section: Introductionmentioning

confidence: 99%

High-Sensitive MEMS Hydrogen Sulfide Sensor made from PdRh Bimetal Hollow Nanoframe Decorated Metal Oxides and Sensitization Mechanism Study

Luo

Chen

Zhang

et al. 2020

ACS Appl. Mater. Interfaces

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Here we report the fabrication of a high performance metal oxide semiconductor (MOS) sensor for the detection of hydrogen sulfide (H 2 S) using PdRh bimetal hollow nanocube (HC) with Rh-rich hollow frame and Pd−rich core frame as sensitizing materials. PdRh bimetal HC with the edge-length about 10 nm was prepared by chemical etching PdRh bimetal solid nanocube (SC) in HNO 3 aqueous solution. The results of gas-sensing tests indicate that the response value order of the MEMS gas sensors based on MOSs (including ZnO, MoO 3 and SnO 2 ) is as follows: R PdRh HC/MOS > R PdRh SC/MOS > R MOS . First, in the system of ZnO, gas sensor modified by PdRh (PdRh SC/ZnO and PdRh HC/ ZnO) possess enhanced H 2 S sensing performance with a better response and excellent lowconcentration detection capability (down to 15 ppb) comparing to pure ZnO. The improved H 2 S sensing performance could be attributed to the good conductivity of Rh−rich frame, the high catalytic activity of PdRh bimetal and formation of Schottky barrier-type junctions and defect. Second, PdRh HC/ZnO sensor shows better response (185-1 ppm of H 2 S) compared to PdRh SC/ZnO sensor (108-1 ppm of H 2 S), which is due to the higher specific surface area of PdRh HC/ZnO and good gas diffusion of the hollow structure. This work indicate that the sensitization characteristics of PdRh bimetal HC will provide new paradigms for the future development of the high performance sensor.

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“…The R1 gels, R1‐Aurod, and R1‐Au1 composites were characterized by a series of optical spectroscopy measurements to assess the formed supramolecular structures. As shown in Figure 2b, compared to the R1 gels, The newly emerging peaks in Raman spectra of R1‐Au1 and R1‐Aurod were recorded at around 260 cm −1 , which were associated with the Au−S interactions [22] and suggested the formation of Au−S bonds in the R1‐Au1 and R1‐Aurod composites. It was also expected that the characteristic peaks at around 119 cm −1 were attributed to the Au−S−C interactions [23] .…”

Section: Resultsmentioning

confidence: 95%

Hysteresis Nanoarchitectonics with Chiral Gel Fibers and Achiral Gold Nanospheres for Reversible Chiral Inversion

Zhang

et al. 2022

Chemistry An Asian Journal

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Intelligent control over the handedness of circular dichroism (CD) is of special significance in self‐organized biological and artificial systems. Herein, we report a chiral organic molecule (R1) containing a disulfide unit self‐assembles into M‐type helical fibers gels, which undergoes chirality inversion by incorporating gold nanospheres due to the formation of Au−S bonds between R1 and gold nanospheres. Upon heating at 80 °C, the aggregation of gold nanospheres results in a disappearance of the Au−S bond, allowing the reversible switching back to M‐type helical fibers. The original chirality of M‐type fibers could also be retained by adding anisotropic gold nanorods. A series of characterization methods, involving CD, Raman, Infrared spectroscopy, electric microscopy, and small‐angle X‐ray scattering (SAXS) measurements were used to investigate the mechanism of chiral evolutions. Our results provide a facile way of fabricating hysteresis nanoarchitectonics to achieve dynamic supramolecular chirality using inorganic metallic nanoparticles.

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Chiroptical study of the bimetal–cysteine hybrid composite: interaction between cysteine and Au/Ag alloyed nanotubes

Abstract: Cysteine-modified Au/Ag alloyed nanotubes with an extended helical network conformation exhibit higher chiroptical responses due to a stronger local electromagnetic field.

Cited by 17 publications

References 45 publications

Highly enantioselective photo-polymerization enhanced by chiral nanoparticles and in situ photopatterning of chirality

Highly enantioselective photo-polymerization enhanced by chiral nanoparticles and in situ photopatterning of chirality

High-Sensitive MEMS Hydrogen Sulfide Sensor made from PdRh Bimetal Hollow Nanoframe Decorated Metal Oxides and Sensitization Mechanism Study

Hysteresis Nanoarchitectonics with Chiral Gel Fibers and Achiral Gold Nanospheres for Reversible Chiral Inversion

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